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// Copyright 2019 The Go Cloud Development Kit Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package blob_test
import (
"context"
"fmt"
"log"
"gocloud.dev/blob"
_ "gocloud.dev/blob/memblob"
)
func Example_openFromURL() {
ctx := context.Background()
// Connect to a bucket using a URL.
// This example uses "memblob", the in-memory implementation.
// We need to add a blank import line to register the memblob driver's
// URLOpener, which implements blob.BucketURLOpener:
// import _ "gocloud.dev/blob/memblob"
// memblob registers for the "mem" scheme.
// All blob.OpenBucket URLs also work with "blob+" or "blob+bucket+" prefixes,
// e.g., "blob+mem://" or "blob+bucket+mem://".
b, err := blob.OpenBucket(ctx, "mem://")
if err != nil {
log.Fatal(err)
}
defer b.Close()
// Now we can use b to read or write to blobs in the bucket.
if err := b.WriteAll(ctx, "my-key", []byte("hello world"), nil); err != nil {
log.Fatal(err)
}
data, err := b.ReadAll(ctx, "my-key")
if err != nil {
log.Fatal(err)
}
fmt.Println(string(data))
// Output:
// hello world
}
func Example_openFromURLWithPrefix() {
// PRAGMA: This example is used on gocloud.dev; PRAGMA comments adjust how it is shown and can be ignored.
// PRAGMA: On gocloud.dev, hide lines until the next blank line.
ctx := context.Background()
// Connect to a bucket using a URL, using the "prefix" query parameter to
// target a subfolder in the bucket.
// The prefix should end with "/", so that the resulting bucket operates
// in a subfolder.
b, err := blob.OpenBucket(ctx, "mem://?prefix=a/subfolder/")
if err != nil {
log.Fatal(err)
}
defer b.Close()
// Bucket operations on <key> will be translated to "a/subfolder/<key>".
}
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